Abstract:

The structure identification and carbonation characteristics of several potassium-based supported sorbents for CO₂ capture were investigated with TGA，XRD，XRF，SEM and N₂ adsorption method.Potassium-based sorbents were prepared by impregnation with potassium carbonate on supports，such as cocoanut activated charcoal（AC1），coal active carbon（AC2），silica gel（SG）and diatomite（DT）using the iso-volume impregnation method.The results showed that the K₂CO₃ loading amounts of AC1，AC2，SG and DT were 24.1%，22.5%，21.7% and 19.1% respectively.The surface area and pore volume of K₂CO₃/AC1 and K₂CO₃/AC2 were larger than others.In contrast，those of K₂CO₃/DT were small.For K₂CO₃/SG，pore volume was large but surface area was small.K₂CO₃/AC1 and K₂CO₃/AC2 showed excellent carbonation capacity.However，the carbonation capacities of K₂CO₃/SG and K₂CO₃/DT were low.The difference in carbonation capacity of those sorbents were attributed to the difference in pore structure，leading to different supported sorbents.